In this article, we will introduce 15 best GTK3 themes for Ubuntu 12.10 (Quantal Quetzal) compatible with Unity and Gnome Shell. The installation of the different themes will be from our PPA which can be added with these commands:

sudo add-apt-repository ppa:upubuntu-com/gtk3

sudo apt-get update

To enable the themes given below, you can use Gnome Tweak Tool. To install it in Ubuntu 12.10, run this command: